Direct field-oriented speed control of asynchronous motors

Direct magnetic field oriented speed control of asynchronous motor : As shown in Figure 13-28, the dot
-dash line diagram is the vector control part. The rotor flux position P (Xt corresponds to ≠ in the working principle) of this asynchronous motor frequency modulation control is obtained
from the shaft position sensor and the rotor slip frequency. The rotor flux angular velocity vector c is the sum of
the motor angular velocity nk and slip angular velocity c, that is,     q - ∞ - ten.     The rotor current z- and torque current component z are generated by the flux model. . They enter the multiplier to obtain the actual motor torque D, which is then compared with the command torque T'. And it is fed back to the field weakening control by t call . This field weakening control technology uses the method of reducing the rotor excitation current to enable the motor to obtain a higher operating speed outside the constant torque zone.